laravel批量更新多条记录

熟悉laravel的童鞋都知道，laravel有批量一次性插入多条记录，却没有一次性按条件更新多条记录。

是否羡慕thinkphp的saveAll，是否羡慕ci的update_batch，但如此优雅的laravel怎么就没有类似的批量更新的方法呢？

Google了一下，发现stackoverflow（ https://stackoverflow.com/questions/26133977/laravel-bulk-update ）上已经有人写好了，但是并不能防止sql注入。

本篇文章，结合laravel的Eloquent做了调整，可有效防止sql注入。

<?php
namespace App\Models;

use DB;
use Illuminate\Database\Eloquent\Model;

/**
 * 学生表模型
 */
class Students extends Model
{
    protected $table = 'students';

    //批量更新
    public function updateBatch($multipleData = [])
    {
        try {
            if (empty($multipleData)) {
                throw new \Exception("数据不能为空");
            }
            $tableName = DB::getTablePrefix() . $this->getTable(); // 表名
            $firstRow  = current($multipleData);

            $updateColumn = array_keys($firstRow);
            // 默认以id为条件更新，如果没有ID则以第一个字段为条件
            $referenceColumn = isset($firstRow['id']) ? 'id' : current($updateColumn);
            unset($updateColumn[0]);
            // 拼接sql语句
            $updateSql = "UPDATE " . $tableName . " SET ";
            $sets      = [];
            $bindings  = [];
            foreach ($updateColumn as $uColumn) {
                $setSql = "`" . $uColumn . "` = CASE ";
                foreach ($multipleData as $data) {
                    $setSql .= "WHEN `" . $referenceColumn . "` = ? THEN ? ";
                    $bindings[] = $data[$referenceColumn];
                    $bindings[] = $data[$uColumn];
                }
                $setSql .= "ELSE `" . $uColumn . "` END ";
                $sets[] = $setSql;
            }
            $updateSql .= implode(', ', $sets);
            $whereIn   = collect($multipleData)->pluck($referenceColumn)->values()->all();
            $bindings  = array_merge($bindings, $whereIn);
            $whereIn   = rtrim(str_repeat('?,', count($whereIn)), ',');
            $updateSql = rtrim($updateSql, ", ") . " WHERE `" . $referenceColumn . "` IN (" . $whereIn . ")";
            // 传入预处理sql语句和对应绑定数据
            return DB::update($updateSql, $bindings);
        } catch (\Exception $e) {
            return false;
        }
    }
}

可以根据自己的需求再做调整，下面是用法实例：

// 要批量更新的数组
$students = [
    ['id' => 1, 'name' => '张三', 'email' => 'zhansan@qq.com'],
    ['id' => 2, 'name' => '李四', 'email' => 'lisi@qq.com'],
];

// 批量更新
app(Students::class)->updateBatch($students);

生成的SQL语句如下：

UPDATE pre_students
SET NAME = CASE
WHEN id = 1 THEN
	'张三'
WHEN id = 2 THEN
	'李四'
ELSE
	NAME
END,
 email = CASE
WHEN id = 1 THEN
	'zhansan@qq.com'
WHEN id = 2 THEN
	'lisi@qq.com'
ELSE
	email
END
WHERE
	id IN (1, 2)

是不是效率有提升一大截呢ヾ(=ﾟ･ﾟ=)ﾉ喵♪